1 If it rains, we musn't go out. 2 If he doesn't come today, I won't call him anymore.3 If you open the window, I will move to other room.4 If you open umbrella indoor, bad luck will "rain" you.5 If you drink two litters of water a day, you will be healthier.

6 If he is busy, I will back tomorrow.7 Will you come tonight if I finish soon my work?8 If her parents can't come, she may change her wedding date. 9 If I go to San Francisco, I will travel by cable car. 10 In case he ask me, I will help him.